Mustard gas is an example of what type of agent?

Mustard gas is classified as a blister agent, which is designed to cause severe skin blisters, respiratory damage, and other debilitating effects upon exposure. Blister agents, like mustard gas, can cause painful blisters on the skin and mucous membranes, making them particularly dangerous in warfare situations. The term "blister agent" highlights the primary effect of these substances, specifically the injury to the skin and respiratory system, which is a defining characteristic of mustard gas. This mode of action is distinct from other types of chemical agents, such as nerve agents, which disrupt the nervous system, choking agents, which primarily cause damage to the lungs, and psychochemical agents, which affect mental processes. Understanding these classifications is crucial for recognizing the specific hazards and appropriate responses to different chemical agents.